Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
ky dang » ky nang, ky danh
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
dai ky » dan ky, dai ly, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: si dai ky dang xa hoi. ((hieu ve) or (hieu van)) ((cam duc) or (giao duc)) van hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: si dai ky dang xa hoi. ((hieu ve) OR (hieu van)) ((cam duc) OR (giao duc)) van hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: si dai ky dang xa hoi. ((hieu ve) or (hieu van)) ((cam duc) or (giao duc)) van hanh than cua tre*.